如何删除XML中的节点 [英] How to delete node in XML

问题描述

如何删除此xml文件中的每个course_code？！

 <   course     xmlns：xsi   =  http://www.w3.org/2001/XMLSchema-instance    xmlns：xsd   =  http://www.w3.org/2001/XMLSchema >  
 <   course_code  >  30 < ;   / course_code  >  
 <   totalnum  >  20 <   / totalnum  >  
 <  名称 >  asd <   / name  >  
 <   coursecat  > 工程<   / coursecat  >  
 <   / course  >  
 <  课程    xmlns：xsi   =  http://www.w3.org/2001/XMLSchema-instance    xmlns：xsd   =  http://www.w3.org/2001/XMLSchema >  
 <   course_code  < span class =code-keyword>>  20 <   / course_code  >  
 <   totalnum  < span class =code-keyword>>  30 <   / totalnum  >  
 <   name  < span class =code-keyword>>  hh <   / name  >  
 <   coursecat  > 艺术<   / coursecat  >  
 <   / course  >  
 <  课程    xmlns：xsi   =  http://www.w3.org/2001/XMLSchema-instance    xmlns：xsd   =  http：// www .w3.org / 2001 / XMLSchema >  
 <  <温泉n class =code-leadattribute> course_code  >  12 <   / course_code  >  
 <  < span class =code-leadattribute> totalnum  >  20 <   / totalnum  >  
 <  < span class =code-leadattribute> name  >  dd <   / name  >  
 <  < span class =code-leadattribute> coursecat  > 艺术<   / coursecat  >  
 <   / course  >  
 <  讲师    xmlns：xsi   =  http://www.w3.org/2001/ XMLSchema-instance    xmlns：xsd   =   http://www.w3.org/2001/XMLSchema >  
 <   instructor_id  >  30 <   / instructor_id  >  
 <   name  >  omar <   / name  >  
 <   phone_num  >  010 <   / phone_num  >  
 <  地址 >  alex <   / address  >  
 <  电子邮件 >  moas @ yahoo <   / email  >  
 <   course_id2  >  12 <   / course_id2  >  
 <   / instructor  >  

我尝试过：



XML移到问题部分并添加了代码块 - OriginalGriff] [/ edit]

解决方案

没有这样的东西，并不是真的需要它。 .NET FCL提供的所有与XML相关的类型都遵循不同的原则：您必须立即编写整个XML。例如，您可以删除XML DOM模型中的节点，但仍需编写完整的XML。如果您考虑一下，您会明白这是一个可行的决定。



这是我对可用XML类的简短概述：

1. 使用 System.Xml.XmlDocument 类。它实现了DOM接口;如果文档的大小不是太大，这种方式是最简单和最好的。
   参见 http://msdn.microsoft.com/en-us/library/system.xml.xmldocument.aspx 。
2. 使用类 System.Xml .XmlTextWriter 和 System.Xml.XmlTextReader ;这是最快的阅读方式，特别是你需要跳过一些数据。
   参见 http://msdn.microsoft.com/en-us/library/system.xml.xmlwriter.aspx ， http://msdn.microsoft.com/en-us/library/system.xml.xmlreader.aspx 。
3. 使用类 System.Xml.Linq.XDocument ;这是类似于 XmlDocument 的最合适的方式，支持LINQ to XML Programming。
   参见 http://msdn.microsoft.com/en-us/library/system.xml.xmldocument.aspx ，http://msdn.microsoft.com/en-us/library/bb387063.aspx 。



-SA

how to delete every course_code in this xml file ?!

<course xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <course_code>30</course_code>
  <totalnum>20</totalnum>
  <name>asd</name>
  <coursecat>Engineering</coursecat>
</course>
<course xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <course_code>20</course_code>
  <totalnum>30</totalnum>
  <name>hh</name>
  <coursecat>Art</coursecat>
</course>
<course xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <course_code>12</course_code>
  <totalnum>20</totalnum>
  <name>dd</name>
  <coursecat>Art</coursecat>
</course>
<instructor xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <instructor_id>30</instructor_id>
  <name>omar</name>
  <phone_num>010</phone_num>
  <address>alex</address>
  <email>moas@yahoo</email>
  <course_id2>12</course_id2>
</instructor>

What I have tried:

[edit]XML moved to question section and code block added - OriginalGriff][/edit]

解决方案

There is no such thing, and it's not really needed. All the XML-related types offered by .NET FCL work on different principles: you have to write the whole XML at once. You can, say, delete a node in the XML DOM Model, but you still have to write whole XML. If you think about it, you will understand that this is a viable decision.

This is my short overview of available XML classes:

1. Use System.Xml.XmlDocument class. It implements DOM interface; this way is the easiest and good enough if the size if the document is not too big.
   See http://msdn.microsoft.com/en-us/library/system.xml.xmldocument.aspx.
2. Use the classes System.Xml.XmlTextWriter and System.Xml.XmlTextReader; this is the fastest way of reading, especially is you need to skip some data.
   See http://msdn.microsoft.com/en-us/library/system.xml.xmlwriter.aspx, http://msdn.microsoft.com/en-us/library/system.xml.xmlreader.aspx.
3. Use the class System.Xml.Linq.XDocument; this is the most adequate way similar to that of XmlDocument, supporting LINQ to XML Programming.
   See http://msdn.microsoft.com/en-us/library/system.xml.xmldocument.aspx, http://msdn.microsoft.com/en-us/library/bb387063.aspx.

—SA

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